Measure your torso length by bending your head forward so your chin touches your chest. Feel for the most prominent bump at the back of your neck. Now measure from that point down to an imaginary line connecting the tops of your hips around your back. This works best with a partner's help.

Disappointed!

We bought this pack for my 12 year old daughter to hike 7.6 miles back country with us. I took her with me to store and an associate suggested and helped fit this pack. We hadn't even finished the hike in when a bracket from the inside broke and tore thru the pack jabbing her in the side. We were unable to "fix" the bracket and resorted to pulling it out so she could finish the hike in comfortably! I will not be buying my backpacking gear from this store again,and will never buy Kelty brand.